Figure 2.

Conditional growth model for impulsivity and sensation seeking assessed between the ages of 13–16 years old predicting substance use at age 16. Standardized estimates shown. Thinner, solid lines indicate significant relationships at p < .05, dashed lines indicate non-significant relationships. Straight, double-arrowed lines indicate a contemporaneous relationship and curved, double-arrowed lines indicate covariances. Heavier, thicker solid lines indicate a significant indirect effect. For family history status, 0 = negative, 1 = positive.